Weather Alerts for Oregon
1. Freeze Warning for: Eastern Curry County and Josephine County; Jackson County
2. Freeze Watch for: Benton County Lowlands; Linn County Lowlands; Lane County Lowlands; Upper Hood River Valley; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills
3. Frost Advisory for: Central Douglas County
4. Frost Advisory for: North Oregon Coast Range Lowlands; Central Oregon Coast Range Lowlands; North Oregon Coast Range; Central Oregon Coast Range; Lower Columbia River; Tualatin Valley; West Hills and Chehalem Mountains; Outer Southeast Portland Metro; West Central Willamette Valley; East Central Willamette Valley; West Columbia River Gorge of Oregon above 500 ft; Clackamas County Cascade Foothills; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills
5. Frost Advisory for: South Central Oregon Coast
6. Wind Advisory for: Eastern Columbia River Gorge of Oregon; Lower Columbia Basin of Oregon; Foothills of the Southern Blue Mountains of Oregon; North Central Oregon; Eastern Columbia River Gorge of Washington; Kittitas Valley; Simcoe Highlands
7. Winter Storm Warning for: Cascades of Marion and Linn Counties; Cascades of Lane County
8. Winter Storm Warning for: East Slopes of the Oregon Cascades
9. Winter Storm Warning for: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
10. Winter Weather Advisory for: Klamath Basin; Northern and Eastern Klamath County and Western Lake County
11. Winter Weather Advisory for: North Oregon Cascades; South Washington Cascades
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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